JDK 21: update JPEs

Author: wesleyegberto

README.md

@@ -11,7 +11,7 @@ A project to explore more about the new features from Java 8 through Java 21.
 
 ## Resume by Version
 
-* [Java 21](java-21/)
+* [Java 21](java-21/) (LTS)
   * Virtual Threads (standard) :rocket:
   * Record Pattern (standard) :rocket:
   * Pattern Matching for `switch` (standard) :rocket:
@@ -20,6 +20,8 @@ A project to explore more about the new features from Java 8 through Java 21.
   * Foreign Function & memory API (preview 3)
   * Unnamed Patterns and Variables (preview)
   * Unnamed Classes and Instance Main Methods (preview)
+  * Prepare to Disallow the Dynamic Loading of Agents
+  * KEM API
 
 * [Java 20](java-20/) (Mar, 2023)
   * Scoped values (incubator)
@@ -43,7 +45,7 @@ A project to explore more about the new features from Java 8 through Java 21.
   * Pattern matching for `switch` (preview 2)
   * Deprecated method `finalize`
 
-* [Java 17](java-17/) (Sep, 2021)
+* [Java 17](java-17/) (LTS; Sep, 2021)
   * Sealed classes (standard)
   * Pattern matching for `switch` (preview)
   * Enhanced Pseudo-Random Number Generator
@@ -97,7 +99,7 @@ A project to explore more about the new features from Java 8 through Java 21.
   * CDS enable by default
   * New GC and improvements
 
-* [Java 11](java-11/) (Sep, 2018)
+* [Java 11](java-11/) (LTS; Sep, 2018)
   * Removal of Java EE Modules, JavaFX and deprecated API
   * Http Client (incubator)
   * var in lambda expressions

java-21/InstanceMainMethodLauncher.java

@@ -1,4 +1,7 @@
-class InstanceMainMethod {
+/**
+ * To run: `java --enable-preview --source 21 InstanceMainMethodLauncher.java`
+ */
+class InstanceMainMethodLauncher {
 	void main() {
 		System.out.println("Hello world from an instance main method o/");
 	}

java-21/PatternMatchingForSwitchTest.java

@@ -1,5 +1,8 @@
 import java.util.*;
 
+/**
+ * To run: `java PatternMatchingForSwitchTest.java`
+ */
 public class PatternMatchingForSwitchTest {
 	public static void main(String[] args) {
 		switchExhaustivenessAndCompatibility();

java-21/README.md

@@ -16,6 +16,8 @@ To run each example use: `java --enable-preview --source 21 <FileName.java>`
 * [445](https://openjdk.org/jeps/445) - Unnamed Classes and Instance Main Methods (Preview)
 * [448](https://openjdk.org/jeps/448) - Vector API (Sixth Incubator)
 * [449](https://openjdk.org/jeps/449) - Deprecate the Windows 32-bit x86 Port for Removal
+* [451](https://openjdk.org/jeps/451) - Prepare to Disallow the Dynamic Loading of Agents
+* [452](https://openjdk.org/jeps/452) - Key Encapsulation Mechanism API
 
 ## Features
 

java-21/RecordPatternTest.java

@@ -1,7 +1,7 @@
 import java.util.*;
 
 /**
- * To run: `java RecordsPatternSecondPreviewTest.java`
+ * To run: `java RecordPatternTest.java`
  */
 public class RecordPatternTest {
 	public static void main(String[] args) {

java-21/UnnamedClassMainMethodLauncher.java

@@ -1,4 +1,6 @@
-
+/**
+ * To run: `java --enable-preview --source 21 UnnamedClassMainMethodLauncher.java`
+ */
 void main() {
 	System.out.println("Hello world from a unnamed class with a main method o/");
 }

java-21/UnnamedClassWithAllowedMembers.java

@@ -1,3 +1,7 @@
+/**
+ * To run: `java --enable-preview --source 21 UnnamedClassWithAllowedMembers.java`
+ */
+
 static String staticField = "can have static field";
 static String privateStaticField = "can have private static field";
 

java-21/UnnamedClassWithInitializers.java

@@ -1,3 +1,7 @@
+/**
+ * To run: `java --enable-preview --source 21 UnnamedClassWithInitializers.java`
+ */
+
 static {
 	System.out.println("static initializer");
 }